bug#58004: 29.0.50; Bounding box of image-crop is unnoticable in certain cases

[Visuwesh]

Attached patch is an attempt to make the bounding box of image-crop more
noticeable.
If you're using image-crop in an image that is mostly white, then it is
very hard to notice the bounding box in a light theme.  I looked for a
way to draw a border around the lines in svg but was unable to find
anything so I settled for drawing a rectangle and darkening the inside
of that rectangle.  Alternatively, one can make the rectangle stroke red
since it is probably rare to come across an image that is mostly red.

Before and after can be tested on the attached image named
"vector_addition.png"

0001-Make-bounding-box-of-image-crop-more-noticeable.patch
Description: Text Data

vector_addition.png
Description: PNG image